The 2.5-liter turbo engine Subaru EJ257 has been assembled at the concern’s plant since 2004 and is primarily known for a series of sport modifications of the Impreza model with the index WRX STI. This engine in a less boosted form was put on the charged versions of the Forester and Legacy.
Engine specifications for Subaru EJ257 2.5 Turbo
Stock modifications
| Displacement | 2457 cc |
| Power system | Injector |
| Engine power | 210 – 250 hp |
| Torque | 320 – 350 Nm |
| Cylinder block | Aluminum H4 |
| Cylinder head | Aluminum 16v |
| Cylinder diameter | 99.5 mm |
| Stroke | 79 mm |
| Compression ratio | 8.4 |
| Engine features | DOHC |
| Hydraulic compensators | No |
| Timing Chain/Belt | Belt |
| Variable Valve Timing (VVT) | AVCS |
| Turbocharger | Yes |
| Oil capacity/Recommended oil | 4.2 l 5W-30 |
| Fuel type | Medium/Plus |
| Euro class | EURO 3/4 |
| Average lifespan | 220 000 km |
Sport modifications STI
| Displacement | 2457 cc |
| Power system | Injector |
| Engine power | 280 – 310 hp |
| Torque | 390 – 410 Nm |
| Cylinder block | Aluminum H4 |
| Cylinder head | Aluminum 16v |
| Cylinder diameter | 99.5 mm |
| Stroke | 79 mm |
| Compression ratio | 8.0 – 8.2 |
| Engine features | DOHC |
| Hydraulic compensators | No |
| Timing Chain/Belt | Belt |
| Variable Valve Timing (VVT) | AVCS |
| Turbocharger | Yes |
| Oil capacity/Recommended oil | 4.3 l 5W-30 |
| Fuel type | Medium/Plus |
| Euro class | EURO 3/4/5 |
| Average lifespan | 200 000 km |
The dry weight of the EJ257 engine is 175 kg
Engine number EJ257 is located on the joint between the block and the box
Subaru EJ257 engine: compression ratio
The Subaru EJ257 engine has a compression ratio of 8.2:1. This means that the volume of the cylinder when the piston is at the bottom of its stroke (the “bottom dead center” or BDC position) is 8.2 times greater than the volume of the cylinder when the piston is at the top of its stroke (the “top dead center” or TDC position).
The compression ratio is an important factor in the performance and efficiency of an engine. A higher compression ratio can result in increased power output and better fuel efficiency, but it can also increase the risk of engine knocking or detonation if the fuel used does not have a high enough octane rating.
In the case of the Subaru EJ257 engine, the relatively low compression ratio of 8.2:1 helps to ensure reliable and consistent performance while minimizing the risk of engine damage due to detonation or knocking.
Fuel consumption
A table of fuel consumption for the Subaru EJ257:
| Driving Conditions | Fuel Consumption |
|---|---|
| City Driving | 15-16 Litres/100 km |
| Highway Driving | 10-12 Litres/100 km |
| Combined | 12-13 Litres/100 km |
Please note that these numbers are estimates and can vary depending on individual driving conditions, driving style, and vehicle condition.
Oil specs of the EJ257
The table of engine oil specifications for the Subaru EJ257 that includes information on oil brands:
| Specification | Value |
|---|---|
| Oil Capacity | 5.4-5.6 Litres |
| Recommended Oil | Synthetic 5W-30 or 5W-40 |
| Recommended Brands | Mobil 1, Royal Purple, Pennzoil Platinum, or equivalent |
| Oil Change Interval | 6 months or 10,000 km |
| Oil Filter Change Interval | Every oil change |
| Typical Cost | $50-$100 for oil and filter change |
The best oils for a Subaru EJ257 engine:
- Mobil 1 Extended Performance 5W-30: This oil is designed to offer maximum protection and performance for high-performance engines like the EJ257. It provides excellent wear protection, reduces engine deposits, and offers long-lasting performance.
- Royal Purple HMX High Mileage Synthetic Motor Oil 5W-30: This oil is specially formulated for high-mileage engines and provides superior wear protection, reduced oil consumption, and improved engine performance.
- Pennzoil Platinum Euro Full Synthetic Motor Oil 5W-40: This oil is designed for high-performance European engines and provides excellent wear protection, improved fuel efficiency, and superior performance in extreme temperatures.
- Amsoil Signature Series Synthetic Motor Oil 5W-30: This oil is formulated with advanced synthetic technology to provide superior engine protection and performance. It offers excellent wear protection, reduces engine deposits, and provides long-lasting performance.
It is important to note that the best oil for a Subaru EJ257 engine may vary depending on the specific model year and individual driving conditions. Always refer to the owner’s manual and follow the manufacturer’s recommendations for proper oil selection and maintenance.
Which cars have the EJ257 2.5 l
| Impreza 2 (GD) | 2004 – 2007 |
| Impreza 3 (GE) | 2007 – 2011 |
| Impreza 4 (GJ) | 2011 – 2016 |
| Forester 2 (SG) | 2004 – 2005 |
| Legacy 4 (BL) | 2004 – 2006 |
| Outback 3 (BP) | 2005 – 2006 |
Maintenance intervals and estimated costs
The recommended maintenance intervals and estimated costs for the Subaru EJ257 engine:
| Maintenance Item | Interval | Estimated Cost |
|---|---|---|
| Oil Change | 3,000-5,000 miles or 3-6 months | $50-$100 |
| Timing Belt Replacement | 105,000 miles or 8 years | $500-$1,000 |
| Spark Plug Replacement | 60,000 miles or 5 years | $150-$300 |
| Coolant Flush | 60,000 miles or 5 years | $100-$200 |
| Air Filter Replacement | 30,000 miles or 3 years | $30-$60 |
| Fuel Filter Replacement | 60,000 miles or 5 years | $50-$100 |
| Transmission Fluid Change | 30,000-60,000 miles or 3-5 years | $150-$300 |
| Differential Fluid Change | 30,000-60,000 miles or 3-5 years | $100-$200 |
| Power Steering Fluid Flush | 60,000 miles or 5 years | $100-$200 |
| Maintenance Item | Interval | Estimated Cost |
|---|---|---|
| Battery Replacement | 3-5 years | $100-$300 |
| Brake Pad Replacement | 30,000-50,000 miles or as needed | $200-$500 |
| Brake Fluid Flush | 30,000 miles or 3 years | $100-$200 |
| Serpentine Belt Replacement | 60,000 miles or 5 years | $100-$200 |
| PCV Valve Replacement | 60,000 miles or 5 years | $50-$100 |
| Valve Adjustment | 105,000 miles or 8 years | $300-$600 |
| Wheel Alignment | As needed or every 10,000-15,000 miles | $100-$200 |
| Tire Replacement | As needed or every 30,000-50,000 miles | $500-$1,000+ |
| Suspension Component Replacement | As needed or every 50,000-100,000 miles | $500-$1,500+ |
| Engine Mount Replacement | As needed or every 100,000 miles | $300-$700 |
Please note that these are recommended maintenance intervals and costs may vary depending on location and specific service providers. Additionally, these costs are estimates and may vary depending on the specific parts and service required. It is always best to consult with a trusted mechanic or dealership for specific maintenance recommendations and cost estimates.
Subaru EJ257 Engine TOP 3 Problems: What You Need to Know
If you’re a Subaru fan, you’re probably familiar with the EJ257 engine. It’s the go-to engine for the WRX STI, and it’s been around for a while. However, like any engine, it’s not without its issues. In this article, we’ll cover the most common problems with the EJ257 engine and what you can do to address them.
Subaru WRX STI Turbo Failures
One of the most common issues with the EJ257 engine is turbo failure. This is especially true for tuned and upgraded engines. While turbo failures can occur on stock engines, increasing turbo boost pressure puts more stress on the turbo, which can shorten its lifespan.
Symptoms of a failing turbo include smoke from the exhaust, whining sounds, power loss, and under-boosting. If you notice any of these symptoms, it’s important to address the issue immediately.
Replacing a turbo isn’t cheap, but it’s necessary to keep your EJ257 engine running smoothly. A new OEM EJ257 turbo can cost over $1,000, and labor to replace it can cost $400-600. Used turbos can be found for less than $500, but there’s always a risk involved.
Subaru EJ257 Internal Engine Problems
Another common issue with the EJ257 engine is internal engine problems. This is especially true for modded engines, as tuning mistakes or pushing the engine too far can lead to costly consequences. Ringland issues, rod bearings, pistons, and ringlands are among the most common internal engine problems.
Symptoms of internal engine failures on the EJ257 engine include smoke from the exhaust, compression loss, knocking or ticking sounds, loss of oil pressure, and excess oil consumption.
Depending on the failure in question, you may be able to catch it in time and prevent further damage. However, internal issues can lead to complete engine failure, which can be as expensive or more expensive to fix than dropping in a new engine.
EJ257 STI Oil Leak Issues
While not a major design flaw, oil leaks are a common issue with many cars and engines, including the EJ257. Valve cover gaskets are among the most common areas for oil leaks, but oil pans and main seals can also be problematic.
Symptoms of oil leaks on the EJ257 engine include visible oil leaks, engine bay smoking, burning oil smell, oil in spark plug holes, and low oil levels.
Valve cover gaskets are relatively inexpensive to replace, but labor costs can add up. Repair shops may charge $200-400 to replace them, but it’s also possible to do it yourself if you have some experience.
Conclusion
The Subaru EJ257 engine is a solid engine that can provide reliability and longevity. However, it’s not without its problems, including turbo failure, internal engine problems, and oil leaks. If you’re experiencing any of these issues, it’s important to address them immediately to prevent further damage and costly repairs.
By understanding these common problems and taking steps to address them, you can keep your EJ257 engine running smoothly for years to come. Whether you’re a DIY enthusiast or prefer to take your car to a professional, it’s important to stay on top of engine maintenance to ensure your Subaru stays on the road for as long as possible.
Reliability
When it comes to the Subaru WRX STI EJ257 engine, reliability is a big concern for many drivers. While the engine isn’t plagued by endless problems, there are a few severe and costly issues that occur more frequently than on the average engine.
One factor that contributes to the EJ257’s reliability issues is the driving style, mods, and tuning of the average WRX STI driver. Many people buy these cars and modify them, and not everyone knows what they’re doing. The EJ257 engine is sensitive and can’t tolerate a lot of abuse, errors, poor tuning, and so on.
That being said, with proper maintenance and a well-set-up tune, the EJ257 can be a reliable engine that provides average longevity. It’s important to use high-quality oils, check oil levels regularly, and change fluids on time.
If you plan to tune your WRX STI EJ257 engine, it’s crucial to ensure that you have a well-set-up and dialed-in tune. When everything is done right, the Subaru EJ257 can be a reliable and extremely fun engine.
In conclusion, while the EJ257 engine isn’t the most reliable engine out there, it can provide solid reliability and longevity with proper maintenance and tuning.
Tuning
A table detailing the potential horsepower gains and associated costs for tuning the Subaru EJ257 engine. Please note that the actual horsepower gains and costs may vary depending on the specific modifications made and the tuner’s rates.
Here is a table you can use as a reference:
| Modification | Estimated HP Gain | Cost Range |
|---|---|---|
| Accessport ECU Tuning | 15-30 HP | $600-$1,000 |
| Cold Air Intake | 5-10 HP | $200-$400 |
| Exhaust System | 10-20 HP | $500-$1,000 |
| Turbo Upgrade | 50-100+ HP | $2,000-$5,000+ |
| Fuel System Upgrade | 10-20 HP | $500-$1,000 |
| Intercooler Upgrade | 10-20 HP | $500-$1,000 |
| Camshaft Upgrade | 20-40 HP | $1,000-$2,000 |
| Cylinder Head Porting | 20-30 HP | $1,500-$3,000 |
| Engine Build | 100-200+ HP | $5,000-$15,000+ |
Please note that the costs listed are estimates and may vary depending on the specific modifications made and the tuner’s rates. Additionally, these figures are based on typical gains seen from these modifications, but individual results may vary.
The Subaru EJ257 engine vs EJ255, EJ207, EJ25
EJ257 vs EJ255
A comparison table of the Subaru EJ257 engine versus the EJ255 engine in terms of reliability:
| Specification | Subaru EJ257 Engine | Subaru EJ255 Engine |
|---|---|---|
| Engine Type | Turbocharged Flat-4 | Turbocharged Flat-4 |
| Displacement | 2.5 litres | 2.5 litres |
| Power Output | 300-325 horsepower | 265-305 horsepower |
| Torque Output | 290-347 lb-ft | 244-290 lb-ft |
| Compression Ratio | 8.2:1 | 8.2:1 |
| Reliability | Known to be reliable with proper maintenance | Known to be reliable with proper maintenance |
| Common Issues | Blown head gaskets, ringland failure, oil consumption | Blown head gaskets, ringland failure, oil consumption |
| Maintenance Intervals | Oil change every 6 months or 10,000 km | Oil change every 6 months or 10,000 km |
| Recommended Oil Type | Synthetic 5W-30 or 5W-40 | Synthetic 5W-30 or 5W-40 |
| Recommended Oil Brands | Mobil 1, Royal Purple, Pennzoil Platinum, or equivalent | Mobil 1, Royal Purple, Pennzoil Platinum, or equivalent |
| Cost of Repairs | Can be expensive due to specialized parts and labor | Can be expensive due to specialized parts and labor |
Overall, both the Subaru EJ257 and EJ255 engines are known to be reliable with proper maintenance. However, both engines have had issues with blown head gaskets, ringland failure, and oil consumption. The maintenance intervals and recommended oil types and brands are the same for both engines. The cost of repairs for both engines can be expensive due to the need for specialized parts and labor.
It’s important to note that while both engines have their own unique characteristics and issues, proper maintenance and care can help to ensure their reliability and longevity.
EJ257 vs EJ207
A detailed comparison table of the Subaru EJ257 engine versus the EJ207 engine in terms of reliability:
| Specification | Subaru EJ257 Engine | Subaru EJ207 Engine |
|---|---|---|
| Engine Type | Turbocharged Flat-4 | Turbocharged Flat-4 |
| Displacement | 2.5 litres | 2.0 litres |
| Power Output | 300-325 horsepower | 276-326 horsepower |
| Torque Output | 290-347 lb-ft | 274-311 lb-ft |
| Compression Ratio | 8.2:1 | 8.0:1 |
| Reliability | Known to be reliable with proper maintenance | Known to be highly reliable with proper maintenance |
| Common Issues | Blown head gaskets, ringland failure, oil consumption | None known |
| Maintenance Intervals | Oil change every 6 months or 10,000 km | Oil change every 6 months or 10,000 km |
| Recommended Oil Type | Synthetic 5W-30 or 5W-40 | Synthetic 5W-30 or 5W-40 |
| Recommended Oil Brands | Mobil 1, Royal Purple, Pennzoil Platinum, or equivalent | Mobil 1, Royal Purple, Pennzoil Platinum, or equivalent |
| Cost of Repairs | Can be expensive due to specialized parts and labor | Can be expensive due to specialized parts and labor |
Overall, the Subaru EJ207 engine is known to be highly reliable with proper maintenance, while the EJ257 engine is also reliable but has had issues with blown head gaskets, ringland failure, and oil consumption. The EJ207 engine has a slightly lower displacement and compression ratio, but still delivers impressive power and torque output. Unlike the EJ257, the EJ207 engine has no known common issues.
The maintenance intervals and recommended oil types and brands are the same for both engines. The cost of repairs for both engines can be expensive due to the need for specialized parts and labor.
It’s important to note that while both engines have their own unique characteristics and issues, proper maintenance and care can help to ensure their reliability and longevity.
EJ257 vs EJ25
| Specification | Subaru EJ257 Engine | Subaru EJ25 Engine |
|---|---|---|
| Engine Type | Turbocharged Flat-4 | Naturally Aspirated Flat-4 |
| Displacement | 2.5 litres | 2.5 litres |
| Power Output | 300-325 horsepower | 165-310 horsepower |
| Torque Output | 290-347 lb-ft | 166-290 lb-ft |
| Compression Ratio | 8.2:1 | 10.0:1 |
| Reliability | Known to be reliable with proper maintenance | Known to be reliable with proper maintenance |
| Common Issues | Blown head gaskets, ringland failure, oil consumption | Blown head gaskets, oil leaks, rod bearing failure |
| Maintenance Intervals | Oil change every 6 months or 10,000 km | Oil change every 6 months or 10,000 km |
| Recommended Oil Type | Synthetic 5W-30 or 5W-40 | Synthetic 5W-30 or 5W-40 |
| Recommended Oil Brands | Mobil 1, Royal Purple, Pennzoil Platinum, or equivalent | Mobil 1, Royal Purple, Pennzoil Platinum, or equivalent |
| Cost of Repairs | Can be expensive due to specialized parts and labor | Can be expensive due to specialized parts and labor |
Overall, both the Subaru EJ257 and EJ25 engines are known to be reliable with proper maintenance. However, the EJ25 engine has had issues with blown head gaskets, oil leaks, and rod bearing failure. The EJ257 engine has also had issues with blown head gaskets and ringland failure, but these issues have been less common in recent model years.
The EJ257 engine is a turbocharged engine and delivers significantly more power and torque output compared to the naturally aspirated EJ25 engine. The EJ25 engine has a higher compression ratio than the EJ257 engine, which can impact its longevity and reliability over time.
The maintenance intervals and recommended oil types and brands are the same for both engines. The cost of repairs for both engines can be expensive due to the need for specialized parts and labor.
It’s important to note that while both engines have their own unique characteristics and issues, proper maintenance and care can help to ensure their reliability and longevity.
Price of the Subaru EJ257
A table comparing prices of the Subaru EJ257 engine in used, remanufactured, and new conditions, as well as the cost of replacement:
| Condition | Price Range | Details and Notes |
|---|---|---|
| Used | $3,000-$6,000 | Prices vary depending on mileage, condition, and location. Used engines may come with no warranty or limited warranty. |
| Remanufactured | $4,500-$7,500 | Remanufactured engines are typically more expensive but come with a warranty and are rebuilt to OEM specifications. |
| New | $5,000-$8,000 | New engines come with a warranty and are built to OEM specifications. Prices may vary depending on location and supplier. |
| Cost of Replacement | $6,000-$9,000 | The cost of replacing a Subaru EJ257 engine can vary depending on the location, labor costs, and parts required. |
Please note that these prices are estimates and may vary depending on the specific model year and condition of the engine. Additionally, the cost of replacement may vary depending on the location, labor costs, and parts required. It is always important to consult with a trusted mechanic or dealer for accurate pricing information.
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